From patchwork Mon Sep 18 11:11:01 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Greenman, Gregory" X-Patchwork-Id: 724384 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DAAD8C46CA1 for ; Mon, 18 Sep 2023 11:13:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237146AbjIRLNV (ORCPT ); Mon, 18 Sep 2023 07:13:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42030 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241433AbjIRLMf (ORCPT ); Mon, 18 Sep 2023 07:12:35 -0400 Received: from mgamail.intel.com (mgamail.intel.com [192.55.52.120]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E47C910D for ; Mon, 18 Sep 2023 04:12:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1695035535; x=1726571535; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=nk9yaiE40tY3rG0eHhncncPn4QSdtadwzRmF+nkFgJg=; b=gy3k/UBNYSmSpHTISkJz5kYfrg5hAMbQnDIR4dcr/faLH2AzvIHsvxTP MJITdAxDEfMOPIh23qjjxmKk5bwDsKiDZ4saN/TTmWHIzH2qVW+Exgg+s ME8hSrXY+86nZxqnWm8DHNwj/auNJ0UUGxzlrDVwDiA9Mj0+qxJa1ExfK vVZYcF8c22r6VCT80iawLpATqLswgpW7N+oZd8RkWbGGLOiLGsyx5Q65q NS0gXgLLbUuVeEdW1nun9/dI4WRjMohZhid0iG13jpuirzZzHQ4vWrIGw t4WNs3mcCUYcvaMAbr17xdYT+LEzbpilf6uNKUnYnLh9vcNlpsI4uVgGD g==; X-IronPort-AV: E=McAfee;i="6600,9927,10836"; a="378535969" X-IronPort-AV: E=Sophos;i="6.02,156,1688454000"; d="scan'208";a="378535969" Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Sep 2023 04:12:15 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10836"; a="861025559" X-IronPort-AV: E=Sophos;i="6.02,156,1688454000"; d="scan'208";a="861025559" Received: from guyarad-mobl.ger.corp.intel.com (HELO ggreenma-mobl2.lan) ([10.214.215.14]) by fmsmga002-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Sep 2023 04:12:14 -0700 From: gregory.greenman@intel.com To: johannes@sipsolutions.net Cc: linux-wireless@vger.kernel.org, Benjamin Berg , Gregory Greenman Subject: [PATCH 16/18] wifi: cfg80211: report per-link errors during association Date: Mon, 18 Sep 2023 14:11:01 +0300 Message-Id: <20230918140607.164cd0ae846c.I40799998f02bf987acee1501a2522dc98bb6eb5a@changeid> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20230918111103.435195-1-gregory.greenman@intel.com> References: <20230918111103.435195-1-gregory.greenman@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Benjamin Berg When one of the links (other than the assoc_link) is misconfigured and cannot work the association will fail. However, userspace was not able to tell that the operation only failed because of a problem with one of the links. Fix this, by allowing the driver to set a per-link error code and reporting the (first) offending link by setting the bad_attr accordingly. This only allows us to report the first error, but that is sufficient for userspace to e.g. remove the offending link and retry. Signed-off-by: Benjamin Berg Signed-off-by: Gregory Greenman --- include/net/cfg80211.h | 3 +++ net/wireless/nl80211.c | 50 +++++++++++++++++++++++++++++++++++++----- 2 files changed, 47 insertions(+), 6 deletions(-) diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h index 9af714431b22..0115fd9bf33a 100644 --- a/include/net/cfg80211.h +++ b/include/net/cfg80211.h @@ -2964,12 +2964,15 @@ struct cfg80211_auth_request { * @elems_len: length of the elements * @disabled: If set this link should be included during association etc. but it * should not be used until enabled by the AP MLD. + * @error: per-link error code, must be <= 0. If there is an error, then the + * operation as a whole must fail. */ struct cfg80211_assoc_link { struct cfg80211_bss *bss; const u8 *elems; size_t elems_len; bool disabled; + int error; }; /** diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index e64bf2a58b36..74eaf74f153a 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -10942,8 +10942,9 @@ static int nl80211_associate(struct sk_buff *skb, struct genl_info *info) if (cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE, req.ie, req.ie_len)) { - GENL_SET_ERR_MSG(info, - "non-inheritance makes no sense"); + NL_SET_ERR_MSG_ATTR(info->extack, + info->attrs[NL80211_ATTR_IE], + "non-inheritance makes no sense"); return -EINVAL; } } @@ -11068,6 +11069,7 @@ static int nl80211_associate(struct sk_buff *skb, struct genl_info *info) if (!attrs[NL80211_ATTR_MLO_LINK_ID]) { err = -EINVAL; + NL_SET_BAD_ATTR(info->extack, link); goto free; } @@ -11075,6 +11077,7 @@ static int nl80211_associate(struct sk_buff *skb, struct genl_info *info) /* cannot use the same link ID again */ if (req.links[link_id].bss) { err = -EINVAL; + NL_SET_BAD_ATTR(info->extack, link); goto free; } req.links[link_id].bss = @@ -11082,6 +11085,8 @@ static int nl80211_associate(struct sk_buff *skb, struct genl_info *info) if (IS_ERR(req.links[link_id].bss)) { err = PTR_ERR(req.links[link_id].bss); req.links[link_id].bss = NULL; + NL_SET_ERR_MSG_ATTR(info->extack, + link, "Error fetching BSS for link"); goto free; } @@ -11094,8 +11099,9 @@ static int nl80211_associate(struct sk_buff *skb, struct genl_info *info) if (cfg80211_find_elem(WLAN_EID_FRAGMENT, req.links[link_id].elems, req.links[link_id].elems_len)) { - GENL_SET_ERR_MSG(info, - "cannot deal with fragmentation"); + NL_SET_ERR_MSG_ATTR(info->extack, + attrs[NL80211_ATTR_IE], + "cannot deal with fragmentation"); err = -EINVAL; goto free; } @@ -11103,8 +11109,9 @@ static int nl80211_associate(struct sk_buff *skb, struct genl_info *info) if (cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE, req.links[link_id].elems, req.links[link_id].elems_len)) { - GENL_SET_ERR_MSG(info, - "cannot deal with non-inheritance"); + NL_SET_ERR_MSG_ATTR(info->extack, + attrs[NL80211_ATTR_IE], + "cannot deal with non-inheritance"); err = -EINVAL; goto free; } @@ -11147,6 +11154,9 @@ static int nl80211_associate(struct sk_buff *skb, struct genl_info *info) err = nl80211_crypto_settings(rdev, info, &req.crypto, 1); if (!err) { + struct nlattr *link; + int rem = 0; + err = cfg80211_mlme_assoc(rdev, dev, &req); if (!err && info->attrs[NL80211_ATTR_SOCKET_OWNER]) { @@ -11155,6 +11165,34 @@ static int nl80211_associate(struct sk_buff *skb, struct genl_info *info) memcpy(dev->ieee80211_ptr->disconnect_bssid, ap_addr, ETH_ALEN); } + + /* Report error from first problematic link */ + if (info->attrs[NL80211_ATTR_MLO_LINKS]) { + nla_for_each_nested(link, + info->attrs[NL80211_ATTR_MLO_LINKS], + rem) { + struct nlattr *link_id_attr = + nla_find_nested(link, NL80211_ATTR_MLO_LINK_ID); + + if (!link_id_attr) + continue; + + link_id = nla_get_u8(link_id_attr); + + if (link_id == req.link_id) + continue; + + if (!req.links[link_id].error || + WARN_ON(req.links[link_id].error > 0)) + continue; + + WARN_ON(err >= 0); + + NL_SET_BAD_ATTR(info->extack, link); + err = req.links[link_id].error; + break; + } + } } free: